improve less formating - part 1 (plugin modules)

- remove @author from comments
- adjust the spacing

css/plugins/mediamanager.less

@@ -2,9 +2,7 @@
  * This file provides styles for mediamanager
  */
 
-
 /* + + + + +  global  + + + + + */
-
 #mediamanager__page {
     .namespaces h2 {
         bottom: 0;
@@ -21,10 +19,8 @@
     }
 }
 
-
 /* + + + + + + + + + + + + + + + + + + + + + + + + + + */
 /* media queries */
-
 @media @screen_max-md {
     #mediamanager__page {
         min-width: 100%;